Which safety issue is considered to be a data safety issue?

Computer and technology-related dangers to an individual's personal, financial, emotional or physical well-being are considered as data safety issues.
There are several things you should do to prevent computer dangers: make regular backups of files, protecting yourself against viruses (use an anti-virus software) , use a  passwords so that access to data is restricted, use a firewall , 

Answer domain name system (dns);